package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.ShoppingCart;
import com.itheima.reggie.service.ShoppingCartService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

@RestController
@RequestMapping("/shoppingCart")
public class ShoppingCartController {
    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 添加购物车
     *
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> save(@RequestBody ShoppingCart shoppingCart) {

        //获取当前用户id
        Long userId = BaseContext.getCurrentId();
        //设置用户id，指定当前是哪个用户的购物车数据
        shoppingCart.setUserId(userId);

        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(ShoppingCart::getUserId, userId);
        //根据当前登录用户ID 及 本次添加的菜品ID/套餐ID，查询购物车数据是否存在
        if (dishId != null) {
            wrapper.eq(ShoppingCart::getDishId, dishId);
        } else {
            wrapper.eq(ShoppingCart::getSetmealId, shoppingCart.getSetmealId());
        }

        //查询当前菜品或者套餐是否在购物车中
        ShoppingCart cartServiceOne = shoppingCartService.getOne(wrapper);
        if (cartServiceOne != null) {
            //如果已经存在，就在原来数量基础上加1
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number + 1);
            shoppingCartService.updateById(cartServiceOne);
        } else {
            //如果不存在，则添加到购物车，数量默认就是1
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }

        return R.success(cartServiceOne);
    }


    /**
     * 查看购物车
     *
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list() {
        LambdaQueryWrapper<ShoppingCart> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());
        wrapper.orderByAsc(ShoppingCart::getCreateTime);
        //根据用户id查询购物车
        List<ShoppingCart> list = shoppingCartService.list(wrapper);
        return R.success(list);
    }

    /**
     * 删除购物车
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean() {
        LambdaQueryWrapper<ShoppingCart> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());
        //根据用户id删除购物车
        shoppingCartService.remove(wrapper);

        return R.success("清空购物车成功");
    }
}
